Somebody tell me what this damn movie was called?

I know there were these two boys who didn't get along. One of them
started fights and always got beat up. There was a scene where he saw
the boy he didn't like kissing a girl he liked through the window,
while he was getting treated after getting hurt. Later on, I think
those two boys were in a sack race together or something.

Does anyone have any idea what I'm talking about? It's an old movie.
Seriously, I don't know how many questions it takes to get one good
answer.